From: Date: March 5 2003 5:39pm
Subject: Re: HAVING vs. WHERE
List-Archive: http://lists.mysql.com/mysql/134037
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go to
http://www.mysql.com/doc/en/Miscellaneous_functions.html

and take a look at
inet_ntoa and inet_aton

you may store IP addresses as integers and the query will be

SELECT inet_aton(inetAdr), * FROM Client WHERE inetAdr <
inet_aton('240.0.0.0') OR inetAdr>inet_aton('239.255.255.255')

the inet_aton will return the IP dotted.

As well, you do not need to use HAVING here.

Hope this helps.

==================
Stanimir Dzharkalov
Developer
Internet Division
MobilTel EAD
email: dune2@stripped
==================
----- Original Message -----
From: "Jonathan Arnold" <jdarnold@stripped>
To: <mysql@stripped>
Sent: Wednesday, March 05, 2003 6:17 PM
Subject: HAVING vs. WHERE


> In the MySQL reference, it warns against using HAVING for items
> that "should" be in a WHERE clause. I'm not sure what items
> "should" be in a WHERE clause.
>
> My exact problem is I want to select some records that have a
> dotted IP address as one of the fields. And I want to filter out
> the multicast addresses, which are the addresses that begin with
> the numbers in the range of 224. thru 239. This does it:
>
> SELECT * FROM Client WHERE left(inetAdr,instr(inetAdr,"."))< 224
>      OR left(inetAdr,instr(inetAdr,".")) > 239
>
> and this works as well:
>
> SELECT *,left(inetAdr,instr(inetAdr,".")) as ia FROM Client HAVING ia <
224
>      OR ia > 239
>
> and it is a little cleaner, although as I'm going to be doing this in a
> PHP script, cleanliness isn't all that important.
>
> So I guess I have 2 questions:
>
> 1] Which should I use?
> 2] Is this the easiest way to check for the multicast address?
>
> --
> Jonathan Arnold     (mailto:jdarnold@stripped)
> Amazing Developments       http://www.buddydog.org
>
> It ain't what you don't know that gets you into trouble.
> It's what you know for sure that just ain't so.  Mark Twain
>
>
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